Phonograph record resurfacing machine



R; M. soMERs PHoNoGRAPH RECORD REsuRFAcING MAcHINE Filed May 9, 1939 ssheetsseet 1 March 5, 1940.

` Il 1. l

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INVENTOR 4 v nu N. man s..

Maffh 5 1940- M. soMERs 2,192,598

` PHONQGRAPH RECORD RESURFACING MACHINE I Filed May 9, 1939 3Sheets-Sheet 2 INVENTOR A ORNEY March 5, 1940. R, M SOMERS 2,192,598

PHONOGRAPH RECORD RESURFACING MACHINE Filed May 9, 1939 3 Sheets-Sheet 5VI/f l: Lh/ I I "'Huzs ////////2/M @'g, l l EY MK A ORNEY Patented Mar.5, 1940 lUNwe-fo sr re s PAT-ENT OFFICE Application May 9, 1939, lSerialNo. S27-2,565

17 Claims.

This invention `relates to phonograph record resurfacing machines,particularly to such machines-as are lused to rosari-ace phonograph rec-'ords of 4theftype employed in commercial phonographs or dictatingymachines, and is especially concerned with the :provision of`improvements in such vmachines -foriacilitati'ng the use -of themachines.

Phonograph record I resurfacing machines lof the form abovementionedcomprise a record support or mandrel, Yan endgate for `the mandrel, a.carriage bearing `a resurfacing -tool settable -into operative'positionArelative to a supported record, and a driving vmeans for rotating themandrel and concurrently :feeding the carriage relative to the vmandrel, as from astart to a terminal position, .to cause v`the .tool totraverse the record. -If the .tool is `in operative position at thegtimeof such tool-,record traversal there `will be taken a -rst or heavy cutIfrom the record. At the completion of a heavy cut the carriage may bereturned to start position for another cut on the record, the carriagereturn being .effected by first disengaging the carriage from itsvfeeding means, usually by tilting thecarriage upwardly, and thenmanually moving the carriage to start-position. If `this second cutis tobe of normal depth the machine will 4be stopped andthe tool will bereset. -If it should, however, be desired 4that this second cut .be of alight or finishing character, the 'machine need not necessarily bestopped-'since the carriage may 'be returned, and the set tool may 'beadvanced towards the record as `loya nishingcut controlling means, eachWhile the machine is running. When the record resurfacing is completedthe `machine is necessarily stopped to permit the ejection of the recordfrom vthemachine.; at this Atime there may be automatically .performedYvarious operations on the machine as an aid to the performance ofanother record resurfacing operation.l n

It is an object of my invention to provide -improved means for renderingrecord resurfacing machines more convenientlyoperable.

It is another object of my invention to eiect an automatic release ofthe resurfacing tool at the completion of .a finishing cut on therecord.

It is another object 0i my invention -to Iprovide means controlled bythe nishing-cutcontrolling means Yfor `causing the release -of .theresurfacing tool Ifrom operative position -as an incident to `rapredetermined movement of the carriage;

It is another object of my inventionto-coritrol thestoppingof theoperation of the machineby the finishing-cut Acontrolling means.

It is another objectof my inventiontov provide new tand improved meansforcontrol-ling -a brake for the mandrel. A Ifeature of my vin'ventionisfto control the mandrel tbrake by an automatically Y operated-meanswhich -is controlledby the nish- 10 ing-cut controlling means.` g

Itis another object v of my invention "to provide means to facilitate'ythe takingof uniform y'depths of cuiI throughout the surface .'o'f therecords to be fresuriaced. `This is done .by-the provision of 15 means`tcaid in locating the -recordandl mandrel in a predetermined angular:position at the Iftirne each itoolasetting lismade.Tlfiis-meansfcomprises v a new and improvedlmandrel `loralre-whichisarranged to V'causethernandrel to fcome VVtorest in 20 a predeterminedangular position upon the stopping ;of the machine. l y l @ther:objects-and .features of imylinvention will more fullyfappear from theSfollowing description and the appended claims. 25

In the 'description of 'my @invention 'reference :is had Ato the.accompanying `dravvings,of which:

l Figure Al a top plan view of a phonograph record Yresurfacing.machinein which a rpreferred embodiment fof myinvention is incorporated.` .In30 this preferred embodiment the 'mandrel brake .is vcontrolled lbythecontrol means for themachine, which Vcontrol means lis 'show-n in fonposition;

Figure 12 is -a vertical sectional view, taken sub-f l stantially alongthe line 2-2 yofligure 11; 35 Figure?) isa vertical sectiona-lvi'ew,'taken-along the line 3-'3 of 'Figure "l, and partly broken away;

Figure 4 'is a fractional cross-:sectional View, taken substantiallyalong the 'line "4-"4 of "Figure 1 and showing in ,dash-*dot lines theoperative position of the nishling-cut controlling means;

Figure l5'is va vertical view, partly Ilin section on vthe ylinee-5 oflFigure l, and showing details of 45 't the brake for the mandrel;

Figure -6 ,isa front Velevational viewgpartly in -section and partlybroken away, showing details of the mandrel brake; i

Figure 'lisa vertical sectional View, taken sub- 50 stantially along theline 'l--T of 4Figure-6;

,Figure 8 is a `fractional top @plan viewA showing a vmodication of :myinvention in 4which the mandrel `brake is controlled :by -the latchv*for the endgate; B5

Figure 9 is a vertical sectional view taken substantially along the line9 9 of Figure 8; and

Figure is a vertical sectional View, generally similar to Figure 9, butshowing another modification of my invention in which the mandrel brakeis controlled by the endgate.

Reference being had to the gures there will be seen a phonograph recordresurfacing machine of a form commonly used to resurface phonographrecords of the type employed in dictating machines, comprising a baseplate l having a lefthand upright standard 2, an intermediate uprightstandard 3, right-hand upright'standards 4 and 5, and an upright boss 6directly to the right of the standard 5. Pivoted to the boss vS is anendgate 'i biased into open position by a torsional spring 8 butnormally held in closed position, shown in Figure l, by an endgate boltor latch 9 pivoted as at II) to the right end portion Il of a guide railI2 extending laterally along the front of the machine. The endgate 'Iand standard 2 respectively carry conically pointedstuds I3 and I4 whichform right and left thrust bearings for a shaft l5 extending laterallyof the machine in parallel relation to the guide rail I2. The shaft I5extends through an oversized hole I6 in the intermediate standard 3, andis provided with a mandrel I'I' for supporting a cylindrical record i8to be resurfaced. To mount or remove a record fromthe mandrel I7 theendgate 'i' is rst opened to free the right end o f the mandrel; duringthe time the endgate is open the shaft I5 is intermediately supported bythe intermediate standard 3 and is retained in engagement with theconical stud i4 by reason of the contact of a collar i9, secured totheshaft by ascrew I3', with the left `side of the intermediate standard 3.

The removal of a record from the mandrel is effected by means of arecord ejector which may comprise a handle |22 secured to a shaft |23pivotally supported by the guide rail I2 and intermediate standard 3. Onthe shaft |23, between the guide rail and the standard 3, there issecured an upstanding arm |24 which carries a shoe |25 lying directly tothe left of the record. The record ejector is normally held inunoperated positiondefined bythe Contact of an extension |24 on the arm|24 with the base plate (see Figure 3), by means of a torsional spring|26 restrained at one end by the base plate and at the other end by thehandle |22. To operate the ejector the handle |22 is raised against theforce` of the spring |26 so as to move 4the shoe |25 rightwardly againstthe record to push the record off of the mandrel.

Parallel to the shaft I5 and guide rail |2 is a rod 20 supported by theleft and right standards 2 and 5. Slidably and tiltably mounted on therod 2|] is a carriage 2| having a sleeve 22 embracing the rod. As shownin Figure 2 the carriage is provided with an arm 23 curved forwardlyover the mandrel I7 and lterminating in a shoe 23 which normallyslidably rests on the guide rail I2. The carriage is steadily moved orfed in a leftward direction across the mandrel (as from a start positionat the right end of the mandrel to a terminal position at the left endof the mandrel) by a laterally extending feed screw 24 rotatablysupported by the left and right standards 2 and 4. Secured to thecarriage sleeve 22 by the screws 25. is a resilient and rearwardlyextending arm 26 carrying a feed nut 21 which normally engages theunderside of the feed screw. When the carriage arm is tilted upwardly,as until a rearwardly and downwardly extending post 28 impinges againsta laterally extending ridge 29 on the base plate (see Figure 2) the feednut 2l is moved downwardly out of engagement with the feed screw; thuswhile the carriage is so tilted it may be manually moved, at will,across the mandrel. When the carriage arm 23 is, however, resting on theguide rail I2, thefeed nut 2'I being then in engagement with `the feedscrew 24, a rotation of the feed screw will cause a slow steady movementof the carriage. In order that such feeding of the carriage will occurcoincidentally with a rotation of the mandrel, the feed screw isprovided with a pulley 34 which is coupled, as by a belt not shown, to apulley 3| on the mandrel shaft l5. In the operation of the machine themandrel Il and feed screw 24 are turned in a clockwise direction, thedirection of thread on the feed screw being such as to then cause aleftward feed of the carriage.

On the right side of the carriage there is an extension 32,square-shaped as viewed from the end, which substantially overlies therod 2|). The extension 32 carries a resurfacing tool 33 comprisingaknife blade 34 mounted on a knife bar 35 which is slidably supported bythe extension 32 for movement towards and away from the record. Themeans for setting the resurfacing tool into operative positiona positionof the tool in which the knife blade 34 engages the recordand forreleasing the same may be of a well known construction such as isdisclosed in Brown Patent No. 2,137,383, issued November 22, 1938, andentitled Record shaving machine.

A tool-setting mechanism of the abovementioned type is sufficientlydescribed in the present instance as follows: A cap 36 is slidablymounted on the extension 32, guided by a guide rod 3l, and coupled tothe knife bar by a compression spring 38 coiled about the knife barbetween the cap 36 and a shoulder 35 on the knife bar, this couplingserving to yieldably move the knife bar downwardly towards the recordwhen the cap 36 is moved downwardly. Thecap 3G is urged upwardly by aspring 39 coiledv about the guide rod 3l, butupward movement of the cap33 relative to the bar 35 is limited by a head 44 on the bar. By reasonof the upward biasing of the cap 36 the knife bar is normally maintainedin inoperative position, this position being defined by the contact of acollar 4| on the bar 35 with the underside 32 of the extension 32. Thesetting of the tool 33 is controlled by a lever 42 pivoted on the `right`side of the extension 32 and having a short arm 43 which is coupled tothe cap 36 by an angular link 44, the link being pivoted to the arm 42by a pin 45 and to the cap 36 by a pivot screw 46. As the lever is swungforwardly in a counterclockwise` direction the cap 36 and knife bar 35are moved downwardly to move the tool into operative position relativeto the record; in the terminal movement of the lever a lock 41,described in detail in the abovementioned Brown patent, is renderedoperative to hold the tool in operative position, thereby setting thetool.

Such forward or setting movement of the lever 42 is limited to theposition shown in Figure 2 by the impingement of the link 44 with thehub 42 of the lever. When the lever is in this most forward position thepin 45 is slightly past dead center with respect to the pivot axes ofthe lever 42 and the pivot screw 46. The upward biasing force exerted onthe cap 36 then causes the lever 42 to be urged in a counter-clockwisedirectionthe direction in which the lever 42 is moved to set thetool-but movement of the lever in such direction :is prevented b-ytheContact of 4the link 41 with fthe .hub 42'.. Thus when the .lever '42reaches :such limited position, the .lever is releasably fheld there .tomaintain .the tool inoperative position. When the "lever Iii is,hcweventripped, vor .moved .slightly in :a 'clockwise direction, Vto#return .the pin .4:5 across `the .dead-center line aforementioned, .thelevervliZ is returned Land the cap '36 is moved upwardly, as .by fthe'spring 3%, to 'render .the .lock il inoperative and thereafter .to.return 'the tool tto inoperative position.

vIn the operation `of resurfacing a record the carriage is lrs't moved.to .bring the tool vinto a position overlying the record. carriagemovement Sis xeffected .by rst .tilting the carriage upwardly, 5toI`disengage the feed .nut frorn the feed-screw fand to raise the toolaway fromy the record, and lthen by .manually Amoving the carriage .intothe .position desired. When the resurfacing tool Vhas vbeen set -intooperative position the carriage jis next fully returned -tostartposition and the machine is then started to `cause mandrel rotationand .a Vfeeding lof the carriage along .the mandrel. -As the .carriageis vthus fed along .the mandrel a rst lor heavy cut is taken from therecord, 'the-.cut-away layer-commonly knownas shavingchips--being.carried by a chipchute 48 downwardly through an opening 8" in the lbaseplate.

The -driving .means for the machine-the means. for feeding the carriageand rotating the mandrel-may comprise a suitable electrical motor (notshown) which may be locatedbeneath the base -plate i and be coupled to-a pulley i8 on the mandrel shaft l5 by a belt (not shown) which may.pass through an opening 5G in the base plate. To control the -rnotorthere is provided a switch 5l, preferably of the single-polesingle-'throw toggle variety, which is mounted on the underside of thebase plate in the front righthandportion thereof. This switch islcontrolled bya-forwardlyextending control lever 52 having a shaft 512extending downwardly through ay boss 53 in the base plate. Secured -tothe lower end of the Ashaft V52 by a shoulder screw Eli is a plate 55having a rearwardly extending arm 56 carrying a slotted, pivoted studA5l through which slidably passes an actuating arm 5B of the switch 5l.When the control lever Ad? is rocked leftwardly and rightwardly the varm5S is moved rightwardly and leftwardly to place .the switch in itsrespective on and off positions, the arm 58 snapping into itsleftwardand rightward positions byreason of the toggle .nature of the switch.

In the :normal use of the machine there are three actionswhich may beselectively performed at the completion of a rst out on the record: thetaking of another heavy cut, the .taking of another cut of alight orfinishing character, or the ej'ecting of the record from the machine.'The taking of another heavy cut involves releasing the tool from itsset position, rendering the niachine inoperative to stop the rotation ofthe record, and Yresetting thetool. The release of the tool is usuallydone as an incident to the stopping of themachine by means of aconstruction such as lis'disclosed .in Huenlich Patent No. 2,095,332,issued October l2, 1937, and entitled Record shaving machine.

A tool-releasing means of the form abovementioned .comprises a link 59carrying a pin 63, in its .forward end portion, Vvwhich engages a canislot .El .provided in a rightwardly extending portion G2 of the plate55. .The link extends rear- 4wardly Aalong :the `'right side of `themachine -ben'eath'the vbase yplate to pivotall-y connect with a rightarm T63 of an angular lever 64 `pivoted. centrally .thereof by ascrew:G5 to .a .boss 66 extending downfrom the I:base plate. A left arm 6l'`of the lever '64 is pivotally `connected fto the right end of a bar'-6.8 1whichzextends vlaterally of the machine along `the rear edge ofthe opening t slightly within this opening. The bar '68 is supported atits left end, in the manner in which it is supported at its right, bymeans -of a link 69 pivoted at .one end to the bar bya'pin l69 vandatthe other end vto a boss l0 extending down from the'base plate, :thelink 69 and arm'l forniing a pair of .parallel rmotion supports for thebar 68 to permit the bar to swing forwardly and rearwardly in parallelArelation 'to the yshaft l5.

On the right side of .the .carriage 2'I there 'is pivotally supported,Vloyarelatively long shoulder screw li, a lever l2 best showninFigure 2.The lever 'l2 operatively connects the bar B8 with the ltool-settinglever 42 and comprises a lower vertical portion 'i3 slidably contactingthe .front edge of the bar 68, a central semi-circular portion'' curvedabout the rod 520 rearwardly thereof and pivoted at its .upper 'end onthe shoulder `screw Il adjacently .of the right side of the carriage, abail portion l5 extendingalongthe screw 1i, and a forwardly extendingarmportion 15 pivoted on the outer end ofI the screw TI and terminating `ata point directly 'below the arm '43 of the toolsettinglever.

The cam slot 6l is arc-shaped .andJhas .at'its rearward end an inwardlyextending switch 'il in .which the pin Ell is retained, as lwhenever theswitchl is inon position (see Figure 1)., by al tension spring l' .which.urges the link 59 leftwardly and forwardly, The link .59 extends forwardly and leftwardly from :the .pin BD `and terminates in a cam face 19adaptedto impinge-'against the boss '53 when lthe control lever 52 ismoved rightwardly to place kthe switch '5l into off position. vIn therstportion of .suchmovement of vthe control lever the pin 6B is held by'the spring 'i3 inthe notch ll, thereby causing the link :59 to be'movedirearwardly by the counterclockwise turning of the plate 55. Arearward movement of the link :59 effects a forward Inovement lof thebar. 68 and, by the contact of the bar with the lever 12,2, vclockwisemovement of the lever l2. When thelever 'i2 is so imovedits armportion1S impingeszup'on .the arm `43 .of the tool-setting -lever 42. to imparta tripping or clockwise movement to the tool-setting lever,

thereby releasing the l.tool from .operative .posi-r tion. Inthe furthermovement of the control lever 52 to placethe switch :5| "intc"offposition the cam yface '19 impinges against the iboss ito limit theleftward'movement ofthe link, the :pin 6i! Vbeing thensmoved out'of'thenotch ll. When the ipin 66 is free Iof thenotch ll the linkiil 'ismoved forwardly by `the spring '13, with .the pin GE! Vcoming to rest inthe 'forward end portion 4of theicam slot S-Lthe forward .position ofthe link beingdened bythe contact of a lug Sil on the arm .El with therear edgeof the bar 68.

.In the 4vleftward movement of the control .lever 52 .to place .theswitch 5i into on position, the pin t0' slides .rearwardly relative tothe cam slot El comes rto rest in the .notch "il, the .bar-SS remainingstationary. Thus it is .seen .that a throwing Aoi .the switch 52 to on.position will not tdisturb a. prior `setting yof the tool; -whereas athrowing of the switch .5l to ioif position will,

as above described, .cause -`a .release :of .the tool, .m

from operative position. It is, however, sometimes desirable to stop themachine Without releasing the tool from operative position as, forexample, at the completion of a rst cut on the record so as to permit aninspection of the record surface for the purpose of determining whethera second or nishing out is necessary. A stopping oi' the machine withoutreleasing the tool may be done by holding the carriage 2l in an upwardlytilted position at the time the switch 5i is thrown to off position, thetilting of the carriage causing the arm d3 of the tool-setting lever i2to be moved away from the arm portion 18 ol' the lever 12 so as tooperatively disconnect the tool from the operating means of the switch5l.

To take a finishing cut on the record the tool, which is left in its setposition, is advanced slightly towards the record by a finishing-cutcontrolling means, and the carriage is manually returned to its startposition and is then fed to its terminal position to cause the tool totraverse the record. This nishing-cut controlling means comprises ashort rod 8l mounted for pivotal movement about its longitudinal axisand extending through the shoe 23 of the carriage in parallel relationto the guide rail. The rod 8i projects radially along its length belowthe shoe 23 throughout a minor portion of its periphery so that thecarriage arm 23 is normally supported by the guide rail by way of therod 8|. The rod 8l is provided with a flat 82 throughout its lengthwhich is normally out of contact with the guide rail; when the rod isturned to bring the fiat 82 into contact with the guide rail, thecarriage arm is lowered slightly to advance the tool towards the record.Turning of the rod 8l is manually effected by means of a ngerpiece 88eX- tending forwardly from .the rod. When the ngerpiece 83 is in theposition shown in Figure 2, the flat 82 is olf the guide rail and thefinishingcut controlling means is in inoperative position; when thengerpiece is, however, moved upwardly into a position indicated indash-dot lines in Figure Ll, the flat 82 is brought into contact withthe guide rail to advance the tool towards the record, the finishing-cutcontrolling means being then in operative position.

vThe above described structure and mechanism are common to recordshaving machines heretofore manufactured and used, and form a part ofthe present invention only in so far as they are related to or combinedwith other mechanism hereinafter described.

Since the taking of a iinishing cut usually cornpletes the resurfacingof a record, the operations which normally follow the finishing cut isto stop the machine and to eject the record therefrom. The tool may alsobe appropriately released at this time as an aid to the resetting of thetool for another record resurfacing operation. Since a tool-resettinginvolves a partial return of the carriage, from its terminal to itsstart position, to bring the tool into a position wherein the tooloverlies the record, it is important that the tool be released beforethe carriage is partially returned in order to avoid possible scrapingof the tool on the record. In accordance with-my invention the aboveoperations are facilitated by the provision of automatically-operatedmeans for causing the machine to be stopped and the tool to be releasedat the completion of the finishing cut, thereby permitting immediateejection of the record from the machine at the completion of the recordresurfacing and normally insuring a release of the tool prior to areturn of the carriage. This automatically-operated means is operated asan incident to the terminal movement of the carriage and is controlledby, or subject to, the nishing-cut controlling means. It is to be notedthat a means for controlling the starting and stopping of the machine,which is subject to the nishing-cut controlling means, has beendescribed and broadly claimed in a copending application of George H.Fritzinger, Serial No. 233,909, filed October 8, 1938, and entitledPhonograph record resurfacing machine," which application and thepresent application have a common owner.

Reference being had to Figures 1, 2 and 4, there will be seen a longangular front-to-back extending lever 84 which is pivote'd as at 85 tothe underside of the base plate. The lever 84 has its rearward end 84terminating at a point to the left of a head 86, provided on the pin 69which pivotally connects the link 69 to the bar 68, and is provided atits front end with an arm 81 extending upwardly through an opening 88 inthe base plate slightly to the rear andto the left of the guide rail I2and terminating into a turnedover lug 81'. Provided on the rod 8| of thenishing-cut controlling means is a rearwardly extending pin 89 whichterminates in a spherical ball 89'. When the finishing-cut controllingmeans is in inoperative position the spherical ball 89 is above the lug81 (see Figure 2') When the nishing-cut controlling means is, however,moved into operative position the ball 89 is moved downwardly so that,in the terminal movement of the carriage, the ball impinges against thelug 81 to cause the lever 84 to be turned in a clockwise direction bythe carriage. Such turning of the lever 84 eiTects, as because of itscontact with the head 86 on the bar 68, a forward movement of the bar 68to cause the release of the tool from operative position, the same aswhen the switch 5I is thrown to oli position as heretofore described.Moreover, as the bar 68 is moved forwardly the plate 55 is turned in acounter-clockwise direction, by reason of the heretofore described lever64 and link 59 which serve to couple the bar 68 to the plate 55, tocause the switch 5I to be thrown to off position. 'Ihus by the terminalmovement of the carriage at the completion of a finishing cut on therecord, the tool is notonly released but the machine is also stopped.

It is an additional feature of my invention that when the switch 5l isthrown to ofi position to stop the machine, either manually by the lever52 or by the terminal movement of the carriage at the completion of afinishing cut as above described, a brake is applied to the mandrel tocause the mandrel to come to rest in a predetermined angular position.The stopping of the mandrel in a predetermined angular position iselected for the purpose of aiding the operator, in repeated settings ofthe tool, to locate the record and mandrel each in a predeterminedangular position at the time of the setting of the tool. It will beunderstood that such locating of the record and mandrel is important inobtaining a uniform depth of cut around the periphery of the recordsince the average depth of cut is of the order of only .002 or less andan eccentricity in the mandrel, which is only of an extent comparable tosuch average depth of cut, may cause a considerable non-uniformity inthe depth of cut around the periphery of the record. Such nonuniformityin depth of cut will, however, be

ord. While records have been made in the past i with an indicating arrowat one endl and` the mandrel with a cooperating groove 99', as shown inFigure 2, by which the recordl could be angularly aligned with. respectVto the mandrel, such alignment could` be made only by firstascertaining the position in which theA mandrel had come to rest andthen orienting the record on the mandrel y rmt-il' the proper alignmentwas obtained. In accordance with my inventionthis alignment .of therecord on the mandrel is very greatly facilitated by the provision of abrake to-cause-the mandrel to 'come to rest always in substantially thesame angular position.

The abovementioned mandrel brake may suitably be of the form shown inFigures 1,73, 5, 6 and 7. This brake comprises a collar 9| rotatablymounted on the mandrelshaft I5 and tting into an annular recess SZprovided in the left end of the mandrel (see Figure 6), the collar 9|being restricted against movement longitudinally of the shaft I5 bymeans of a pin 93 which passes through the hub 9I of' the collar 9| toengage an annular groove gli in the shaft, as shown in Figure 1. Thecollar is resiliently coupled to the mandrel bymeans oi' a torsionalspring 95`which is disposed in the recess 92 between thev collar 9i andthe mandrel as shown in Figure 7, and which is connected at one end to apin 96 on the mandrel and at the other end to a pin 91 on the collar. Tothe left of the collar v9| there is providedA an upright stop member orlever 98 which is pivoted on the rod |23 that supports the recordejector. To render the mandrel brake operative the lever 98 is movedrightwardly substantially into cont-act with the collar 9I so as to stoprotation of the collar by the impingement of a cross lpin or tooth 99 onVthe collar with a pin 98' on the lever (the direction of rotation ofthe mandrel being counter-clockwise as the mandrel is viewed` from theright). Such stopping of the collar 9i is adapted to occur at, orshortly after, the time the power to the machine is shut oil'. Themandrel will at such time have suiiicient kinetic energy stored thereinto cause the mandrel to turn through severalrevolutions before it isstopped. The turning of the mandrel which is subsequent to the time thepower to the machine is shut oir and tothe time the collar 9| is stoppedagainst rotation, is opposed by the winding of the torsional spring 95',such winding causing .the kinetic energy of the mandrel to be convertedinto potential energy in the spring. When this 'conversion of energy iscompleted, the cycle isreversed, the mandrel being then turned in areverse or clockwise direction by the spring 95.

The reverse turning of the mandrel is, however,

limited by a ratchet comprising a catch or ltoo-thv .ISD extendingleftwardly from the rim of the mandrel and a pawl iol pivoted at I 92 onthe IM, connected between the pawl and a pinv Ill` on an arm IBS of thelever (see Figure 6) but the pawl is `limited in movement in thedirection ofv its biasing by the impingement of an extension |107 of thepawl against the lever 98 at the base of thev slot ID3; When the lever98L' is; moved towards the mandrel: to stop the collar 9.I the pawlIIIIIis 'moved into. thepath of theA tooth IUI). ADue to the upper edgeYII'of the pawl IIlI being inclined (see Figure 6) the toothsreadilyslides past the pawl IDI so as not to impede the counter- `clockwiseturning of the mandrelthe direction infwhich the mandrel is driven inthe operation of themachine. When, however, the mandrel is turned in.its, reverse direction by the spring 95, as above explained, the toothIUI) impingesagainst the underside ,ofi the pawl to stopthe turning ofthe mandrel, the mandrel being thus always stopped in the. same angularposition. In order that-.the mandrel will not be moved by the torsionalYAspring 95 when the mandrel bralie is moved to"inoperative positiontheposition the brake occupies in Fig. 3--the brake is arranged so that thepin 98 will disengage from its cooperatingpin` 99 on 'the collar 9ibefore the pawl Iii! is disengaged from its cooperating tooth Illu onthey mandrel.

TheV mandrel brake is preferably controlled so that it will be renderedoperative coincidentally with the shutting oi' of the power to themachine, i. e., with the throwing of the switch 5I to off position. Themeans for so controlling the mandrel brake is shown in Figures l and 3,and comprises a slide barv Hi8 which vis mounted on the back side of theguide rail I2 by means of a pair of. shoulder screws |69 which passrespectively throughy a pair of slots I I9 in the bar 09 to thread intorespective bosses I I I extending rearwardly of the guide rail. The barIBB is coupled to the mandrel brake by means of a socket H12' at itsleft end which engages a cross pin H3. onthe arm E96 of` the lever 98,and is urgedrightwardly by a tension spring I I4 to bias c leitwardlyvto throw the switch 5i into on po siti'on the bar I G8 is movedleftwardly, by theimpingement of the extension H upon the shoe l. I6, torender the mandrel brake inoperative, the brake-being retained ininoperative position against its biasing when the machine is in.operation by the biasingof' the plate 55 as caused by the toggle natureof the switch 5i. When the control lever 52 is, howeveninovedrightwardly to throw the vswitch 5I into o position the mandrel brake ismoved into operative position by the spring i It, thereby" applying thebrake to the mandrel'as an incident to the stopping of the machine.

In Figures 8-and 9 there is shown a modiied brake, which may be of theform above described or of conventional form, is controlled by theendgate latch 9. In this modification the bar Hi8 almost to the rightend of the guide rail and having the arm II'I removed, and is given thereference character IBM. At the right end of kthe bar IIlSa there isprovided al vshoe IIS! which extends upwardly to the level of the shaft9 of the endgatelatch 9, and on the shaft 9' there isv provided arearwardly extending pin IZU; As

is slightly altered, being extended rightwardly the endgate latch 9 ismoved to operative position-the position it occupies in Figure S-to holdthe endgate l in closed position, the pin 20 impinges against the shoeH9 and moves the bar IBSa leftwardly to render the mandrel brakeinoperative. When the endgate latch 9 is, however, moved to inoperativeposition to open the endgate, the pin `|20 is moved free of the shoe H9and the bar Ia is moved rightwardly by the spring H4 to render themandrel brake operative.

In another modification of my invention, shown in Figure l0, the mandrelbrake is controlled directly by the endgate l. In this modification thebar |98 is again altered and is given the reference character (08h, thebar having the arm Ill removed and being extended rightwardly, slightlyfurther than the bar la, to terminate in a shoe i 2|. When the endgate'l is closed the bar lllb is retained in its leftward position by theabutment of the shoe l2! against the endgat-e to render the mandrelbrake inoperative. However, as the endgate is opened it is moved free ofthe shoe |2l, thereby permitting the bar lb to move rightwardly, asbecause of its biasing, to render the mandrel brake operative.

Although I have herein shown and described certain embodiments of myinvention, it will be understood that these embodiments are subject tomany changes andmodications without departure from the scope of myinvention, which I undertake to express according to the followingclaims.

I claim:

l. In a phonograph record resurfacing machine having a record support:the combination of a carriage means movable relative to said supportbetween start and terminal positio-ns; a resurfacing tool on saidcarriage means settable into operative position relative to a supportedrecord; a nishing-cut controlling means movable between operative andinoperative positions; and means, operatively associated with both saidcarriage means and said finishing-cut controlling means and controlledaccording to the positioning of both said means, for causing said toolto be moved out of operative position.

2. In a phonograph record resurfacing machine having a record support:the combination of a carriage movable relative to said support; aresurfacing tool on said carriage settable into operative positionrelative to a record on said support; a iinishing-cut controlling meansfor advancing the tool towards the record; and means, controlled by saidfinishing-cut controlling means and operated by said carriage, forcausing said resurfacing tool to be moved out of operative position.

3. In a phonograph record resurfacing machine having a record support:the combination of a carriage capable of forward and return movementsrelative to said support; a resurfacing tool on said carriage settableinto operative position relative to a record on said support; afinishing-cut controlling means for advancing the tool towards therecord; and means, controlled by said finishing-cut controlling meansand operated incidental to the movement of said carriage through the endportion of its forward travel, for causing said resurfacing tool to bemoved out of operative position.

4. In a phonograph record resurfacing machine having a record support:the combination of a carriage adapted to be driven and otherwisemanually moved relative to vsaid support; a resurfacing tool on saidcarriage settable into operative position relative to a record on saidsupport; means for driving said carriage; aiinishingcut controllingmeans for advancing said tool towards the record; and means, controlledby said finishing-cut controlling means and operated incidental to adriven movement of said carriage through a predetermined portion of itspath of travel, for causing said resurfacing tool to be moved out ofoperative position.

5. In a phonograph record resurfacing machine having a record support:the combination of a carriage; a resurfacing tool on said carriagesettable into operative position relative to a record on said supportand releasable therefrom; a l

finishing-cut controlling means having operative and inoperativepositions; means for driving said carriage in a direction operative to.cause a cut to be taken from the record by said tool; and means,operatively connected with said tool and rendered effective when saidfinishing-cut controlling means is in operative position, for releasingsaid tool at the completion of a finishing-cut on the record.

l 6. In a phonograph record resurfacing machine having a record support:the combination of a movable carriage; a resurfacing tool on saidcarriage settable into operative position relative to a record on saidsupport and releasable there.- from'; a finishing-cut controlling meansmovable into operative position to advance said tool towards the record;and means, effective only when said finishing-cut controlling means isin operative position and operated incidental to a predeterminedmovement of said carriage, for causing the release of said tool.

7. In a phonograph record resurfacing machine having a record support:the combination of a carriage; a resurfacing tool on said carriagesettable into operative position relative to a record on said support; afinishing-cut controlling means movable into operative position; drivingmeans for moving said carriage to cause said tool to traverse therecord; a control device movable to start and stop said driving means;and means, operated incidental to the terminal movement of said carriagewhen said finishing-cut controlling means is -in operative position, formoving said control device to stop said driving means and forconcurrently causing said tool to be moved out of operative position.

8. In a phonograph record resurfacing machine having a rotatable recordsupport: the combination of a tool-carriage; means for driving saidtool-carriage relative to said support; a control device movable tostart and stop the operation of the machine; va finishing-cutcontrolling means movable into Operative and inoperative positions; andmeans, effective only when said finishing-cut controlling means is inoperative position and operated by the terminal movement of saidtoolcarriage, for moving said control device to stop the machine.

9. In a phonograph record resurfacing machine having a record-supportingmandrel: the combination of a tool-carriage; driving means for rotatingsaid mandrel and moving saidtoolcarriage along the mandrel; a controldevice movable to start and stop the operation of the machine; afinishing-cut controlling means movable into operative and inoperativepositions; a mandrel brake; and means, operated incidental to theterminal movement of said tool-carriage only when said finishing-cutcontrolling means rendering said mandrel brake operative.

10. In a phonograph record resurfacing machine having a rotatablerecord-supporting` mandrel: the combination of a mandrel brake; atool-carriage movable along said mandrel into a terminal position; aresurfacing too-l settable into operative` position relative to asupported record and release-ble therefrom; a finishing-cut controllingmeans for advancing said tool towards the record; a control devicemovable t0 start and stop the operation of the machine; and means,controlled by said iinishing-cut controlling means and operatedincidental to the movement of said carriage into its terminal position,for releasing said tool, moving said control device to stop the machineand rendering said mandrel brake operative.

11. In a phonograph record resurfacing machine having a rotatablerecord-supporting mandrel: the combination of a tool-carriage movablealong said mandrel; a nishing-cut controlling means movable intooperative and inoperative positions; a mandrel brake; and means,operated incidental to the movement of said toolcarriage and controlledaccording to the posi-- tioning of said finishing-cut controlling means,for rendering said mandrel brake operative.

12. In a phonograph record resurfacing machine having a rotatablerecord-supporting mandrel: means for stopping the rotation of saidmandrel caused by the storage of kinetic energy in lthe mandrelcomprising means for converting the kinetic energy in said mandrel intopotential energy, and means for utilizing said potential energy to causesaid mandrel to be held substantially in a predetermined angular'position when yieldable means to a predetermined position in sitsangular travel.

14. In a phonograph record resurfacing machine having arecord-supporting mandrel and means for rotating said mandrel: thecombination of a control device for rendering said rotating meansineffective; and a brake for said mandrel comprising clutch meanscontrolled by said control device, means controlled by said clutch meansfor converting kinetic energy of rotation of said mandrel into potentialenergy, and means for utilizing saidpotential energy to cause saidmandrel tol be yieldably held in a predetermined angular position Whensaid energy conversion is completed.

15. In a phonograph record resurfacing machine havinga record-supportingmandrel and combination of driving means for rotating saidv mandrel; acontrol device operable to render said driving means ineiective torotate said mandrel; and a brake for said mandrel controlled v by saidcontrol device and comprising an engageable device having yieldablemeans for opposing rotation of said mandrel in the direction of itsdriven movement, and a ratchet-catch for limiting the rotation of saidmandrel by said yieldable means in the direction opposite to its drivenmovement, whereby upon rendering said driving means ineffective saidmandrel is brought to rest in a predetermined angular position.

17. In a phonograph record resurfacing machine having arecord-supporting mandrel and means for rotating said mandrel: thecombination of control means for rendering said rotating meansineffective; and means for stopping said mandrel in .a predeterminedangular position When said driving means is rendered ineffectivecomprising a member angularly stationary relative to the movement ofsaid mandrel, a yieldable clutch means controlled by said control meansfor resiliently coupling said mandrel with said member, and means forlimiting reverse movement of said mandrel by said yieldable means to a.predetermined position in its angular travel. RICHARD M. SOMERS.

